import java.util.HashSet;
import java.util.Set;

public class SolutionLCP11 {
    public int expectNumber(int[] scores) {
        Set<Integer> set=new HashSet<>();
        for (int score : scores) {
            set.add(score);
        }
        return set.size();
    }

    public static void main(String[] args) {
        System.out.println(new SolutionLCP11().expectNumber(new int[]{1,2,3}));
    }
}
